Process of dry distillation



ERIK LUIDVIG RINMAN, (2F DJURSHCLM, SVIEIDEN.

PROCESS or DRY msrriiLATIon.

Patented July 27,1920.

154?,713; Specification of Letters Patent. 3 Drawing. application ruea November 6, 1918. Serial No. 261,319.

2'10- aZZ 10. 50222 it may concern:

Beit known that I, ERIK Lnmro RINMAN, a subject of the King of Sweden, residing at- Djursholni, in the Kingdom of Sweden, have invented a new and useful Improvement in Processes of Dry Distillation, oi which the following is a specification.

The present invention relates to a process of dry distillation with strong bases of mixtures of carbon acids, as well asmixtures thereof with substances containing lignin. The process is particularly applicable to the .dry distillation with strong bases ofl. lVaste liquors from the soda cellulose manufacture,

2. Waste liquors obtained by completely dissolving vegetable substances by boiling with caustic soda lye,

3, Waste liquors obtained by boiling waste liquors from the suliite-cellulose nanufacture, or portions of such liquors, with hydrate of lime,

l. Waste liquors obtained by treating .vegetahle substances with caustic soda lye or other alkaline substances; for instance hydrate of lime, for producing fibers capable of being spun, or the like.

The present process is based on the discovery made by the inventor that when the above mentioned substances, also when they are mixed with one another, are dry distilled withstrong bases, and if the dry distillation is carried out in the presence of steam, each of said substances will be decomposed at a. definite temperature just as if each substance was dry distilled separately. When dry distilling mixtures of the said substances care should thus be taken that every such temperature of decomposition of a substance is maintained during such long time that each distillate may be gathered separately. This is most easily attained by etfecting the heating during the dry distillation by means of direct heat transmitted by superheated steam or by superheated steam mixed with gases produced by thedistilla- 'tion. This is preferably carried out by rapidly iorcing for instance by means of a fan, these gases which transmit the heat, into direetlzontact with the mass L0 be dry distilled Furnac in which the gases proto distillation are brought into c '15 of a fun and are heated by oi-s, afterward to be I a. & Litllic forced into contactwith the mass to,

be dry distilled, are thus most suitable for properly carrying out the present process.

The process will be easily understood from the following examples:

Emample 1.

The dry distillation of a waste liquor obtained by treating straw with a caustic soda lye at about 100 C. so that about 360 gr. organic substance is extracted from 1 kg.

air-dried straw, is suitably. carried out in the following" manner: Themass to be dry distilled should contain, for 100 parts by weight organic substance, about 50 parts by weight Na- 0 and 50 parts by weigh CaO.

Example 2.

The dry distillation of a waste liquor obtained from the production of sodacellulose from wood may be carried out in the following manner: On 100 parts by weight organic substance the mass should preferably contain about parts by weight Na O and 35 parts by weight CaO. During the dry distillation the temperature is maintained within the same ranges as given under EX- ainple 1, the same products being formed and obtained with the difference that the quantity of wax is inconsiderable.

Example 3.

The dry distillation of a waste liquor obtained by completely dissolving wood by boilin with caustic soda 1 e may be carried out in the following manner: On 100 parts byweight organic substance the mass should preferably contain about 60 parts by weight Ne t.) and about 30 parts by weight CaO. Temperatures and products are the same as in Example 2.

Example 41,

Dry distillation of waste liquors obtained by rotting flax with caustic soda lye: ()n

Dry diszfiiiiaL-ion of "exists his; 1101's Mimi? by bailing 22v suififibs waists liqiioii' with h irsts of lime: On 190 parts Wsigiu; 0rgarziic subsisnce the mass to dry dis iiied should sontain about 50 parts by Weight E31 0 and absut 50 parts by Weight CW3, The distillation is carried 0111: in the same manner as in Example 2, and the products obtained are also the same.

The advantages of appiying the preseni' process to the dry distillation with strong bases 0f the sbovementionsd waists liquors anci similar substances, are sry cording to the. present prcsss the womi spirit formed at the dry ditiiiat-isn is obiaineii separated iiozn acetone at the production, which is of ths greatest importance in View of the difiicuity of separating thsss substances by rectification. *When periarm ing the dry distillation according to the present procsss a better result is obtained an ikiistils 01f.

ifiG parts 7 Weight organic substs-mc ihs than when (is mass io'bs iii-y distiii-ed sheuid'csnmin abs t s 1" i sai ors ussd, get 0. m

'56 parts by Weight @31 0 and abm, 56 quziii 3; but aisn as ards quan'ity by Weight CsUL The dry distiiia i; iiltiiiflili'fi the quantity (if methyl =is0hsi carried out as stated in. Emmpie 1. 1?; is as Wsii as of acetone formsci is incrsziseii lfiwsver, that the quail y Y'Qij nsnsicisraiiiiy for the i'szissii 'iziisi iii? of Wax is pimiiculsi'ly large. This is Substance-s swimming igiiizi which form the sass wish Waste iiqllSZS from bmiiing mi iiyi 211601103 decsmp iissgi, airs ezntis grass, for instance sspzirfio, with composed befor the substmicss fimminif t m; 53, 1 7, are (iscempsssgi. Q11 menus; hays .1d :5 A. on gii which tons and weed spi smsrsbiy reams-(L ii claim:

veirf;

amp

The process of 'Lily iis aiiimcisn 0f the Waste ilqusi-s t the ceiiuiose maiiufactwce,

as weii as either sim iaic waste lisp-ms, which consists in. try c-iistiliing said waste iiquoi's with strong bases in the presence of steam at a temperature maintained below 200 C twill the, waver in the mass has 811105 331 tiaiiyciistiiisd ofi', ziitsiwzii'd maintaining the tenipsriitui's between 200 21,116. 369 (1 lint yl alcoimi been, aimed 1y distilled 01?, and fimiily maiiitaining the temperature between 3GO U. s1i500 C. as long as acstnne 1S iormsd QRIK- LYHEVIG RINK AN. 

